iOS 9.0 (build 13A5344) is an official Apple over-the-air update for the iPhone 4s, released on 2015-09-16T18:02:02Z. The update package is 1.09 GB. This is a delta (partial) update that requires null already installed. This update is no longer signed by Apple, meaning it can no longer be applied on-device through Settings.

Payload file: 0f45d8e0f54d8e2a22ad5540f0b7c18a1e747050.zip.